I’ve got ~25 NiMH/li-ion/multi-chem chargers here and have the Opus BT-3400 v. 2.2 (US seller model w/updated fan and display on/off) and it’s a very good 4 bay analyzing charger that gives us a good idea on how are batteries/cells are performing.
The Liitokala Lii 500 Engineer is a good charger, but like everything, you have to watch out for clones and not all of them are the same.
Chris